Yet the device viewed these as requests from multiple different DHCP clients. The DHCP Client Identifiers, the DHCP servers viewedĪll the device's DHCP requests as coming from a single client, Since the 1998 modification caused the DHCP servers to ignore Same hardware type and client hardware address, butĭifferentiates among the requests by using different
To simultaneously obtain more than one IP address for a single Trying to use varying DHCP Client Identifier values Recently we have learned there are some devices That allowed even clients configured to send bad DHCP Client Identifier values It instead relied solely on the hardware type OIT DHCP Service to ignore the DHCP Client Identifier option. On their DHCP client software, in 1998 OIT modified To shield those customers from the misconfiguration Since OIT DHCP Service (and OIT BootP Service) identifiesĬlients by hardware address, this caused those DHCP clients The client's hardware type and hardware address.
Apple what is dhcp client id software#
This caused their DHCP client software to sendĪ DHCP Client Identifier option to the DHCP server withĪn arbitrary value that no longer matched Some customers on campus mistakenly entered arbitrary Not understanding the purpose of this field, Or it sent a DHCP Client Identifier option that matched To continue to operate as before it either added noĭHCP Client Identifier option in its requests to the DHCP server, Leaving that field empty caused the DHCP client software Was changed to add a place for the customer to override the The software used to configure the device's network interface Software to use arbitrary DHCP Client Identifier values. To allow customers to configure their DHCP client To clients based on their hardware addresses.Ī number of years ago, some operating systems were enhanced OIT DHCP Service (and OIT BootP Service) provides service On the campus network, devices (more precisely, network interfaces)Īre uniquely identified by their (Ethernet or Wireless) hardware addresses. Traditionally, the DHCP Client Identifier (when present) hasīeen set to a value equal to the hardware type followed This is an arbitrary value that may be used to identifyĪ client instead of the hardware type and client hardware address. Of the client's network (Ethernet or Wireless) interface.Įvery request sent from a DHCP client to DHCP servers may optionallyĪlso contain a DHCP Client Identifier option. The client hardware address is simply the hardware address Most common reasons (and solutions) for such a mismatch appearĮvery request sent from a DHCP client to DHCP serversĬontains a hardware type and a client hardware address.įor Ethernet and 802.11 wireless clients, the hardware type These DHCP clients will need to be reconfigured to resume functioning. (Most of these are DHCP clients which were misconfigured or malfunctioning Ī handful are DHCP clients using a rarely-used way to identify themselves.) Receiving OIT DHCP service will stop receiving that service. (mostly misconfigured or malfunctioning ones) This change will resolve a DHCP problem for some clients.Īs a side effect, a small number of DHCP clients that have been Has been modified to perform an additional validation check DHCP Client Identifier Must Match Client Hardware Type and Hardware Address